/******************************************************************************
 * Copyright (C) 2015  671643387@qq.com
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 *****************************************************************************/

#ifndef SHARED_AUTH_AUTHCRYPT_H_
#define SHARED_AUTH_AUTHCRYPT_H_

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif

#include <cstddef>
#include <cstdint>
#include <vector>
#include "Shared/Global_Macros.h"
#include "Shared/Crypto/BigNumber.h"


namespace Shared {
namespace Auth {

    class AuthCrypt
    {
    public:
        AuthCrypt(void);
        ~AuthCrypt(void);

        const static std::size_t CRYPTED_SEND_LEN = 4;
        const static std::size_t CRYPTED_RECV_LEN = 6;

        void init(void);
        void setKey(std::uint8_t *key, std::size_t size);
        void decryptRecv(std::uint8_t *data, std::size_t size);
        void encryptSend(std::uint8_t *data, std::size_t size);
        inline bool isInitialized(void) const {
            return _inited;
        }

        static void generateKey(std::uint8_t *key, Crypto::BigNumber *bn);

    private:
        std::vector<std::uint8_t> _key;
        std::uint8_t _send_i, _send_j, _recv_i, _recv_j;
        bool _inited;
        DISALLOW_COPY_AND_ASSIGN(AuthCrypt);
    };

}}

#endif // SHARED_AUTH_AUTHCRYPT_H_
